Widespread changes in UK air quality observed from space

Widespread changes in UK air quality observed from space
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从太空观察到的英国空气质量的广泛变化

DOI:
10.1002/asl.817
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发表时间:
2018
影响因子:
3
通讯作者:
Pope R
Pope R
中科院分区:
地球科学4区
文献类型:
--
作者:
Pope R

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以前的研究使用了污染物的表面观测(例如,二氧化氮[NO2]和气溶胶),以评估近几十年来英国空气质量的改善情况。然而,地面监测网络提供的空间覆盖范围有限,并不总是代表更广泛区域的空气质量。卫星观测,如对流层NO2柱(Thoc 2),气溶胶光学厚度(AOD)和子柱(0-6公里)臭氧(SCO 3),提供了全国范围内的空气质量监测。在这项研究中,我们使用这样的观测结果来分析2005年至2015年期间英国空气质量的趋势,发现英国污染热点地区的Thoc 2和AOD显着下降。短期NO2的最大变化位于人口稠密的地区(即,污染源)区域,与氮氧化物(NOx)的大量排放有关。气溶胶光学厚度的变化更分散,与源区的关联性较弱,这是由于气溶胶寿命较长,二次气溶胶形成和非城市气溶胶源。SCO 3在英格兰/威尔士没有显示出显著的趋势,但在苏格兰有显著的正趋势,这与以前对西北欧其他偏远地区对流层臭氧背景变化的研究一致。
Previous studies have used surface observations of pollutants (e.g., nitrogen dioxide [NO2] and aerosols) to evaluate improvements in United Kingdom (UK) air quality over recent decades. However, surface monitoring networks provide limited spatial coverage and are not always representative of air quality over a wider region. Satellite observations, such as tropospheric column NO2(TCNO2), aerosol optical depth (AOD) and sub‐column (0–6 km) ozone (SCO3), provide widespread monitoring of air quality on a national scale. In this study, we use such observations to analyse trends in UK air quality, between 2005 and 2015, finding significant decreases in TCNO2and AOD over UK pollution hotspots. The largest changes in short‐lived NO2are located over populated (i.e., source) regions, associated with large emissions of nitrogen oxides (NOx). AOD changes are more spread out, and less strongly associated with source regions, due to a longer aerosol lifetime, secondary aerosol formation and non‐urban aerosol sources. SCO3shows no significant trends over England/Wales, but significant positive trends over Scotland, which is consistent with previous studies of changes in background tropospheric ozone in other remote regions of north‐western Europe.
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发表时间: 2014
影响因子: 3.8
作者:
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